Battery packs and electrical equipment

Abstract

The present invention provides a battery pack and an electrical device which are configured so that the position of a battery-side terminal portion does not shift even when a case is subject to impact resulting from falling and the like. A battery pack 1 has an upper case 10 and a lower case 2 sandwiching therebetween a separator 50 holding a battery while a circuit board 70 having the battery-side terminal portion is fixed to the separator 50. Hooks 61, 62 are provided in parts of the separator 50 which face the upper case 10, and the upper case is provided with recessed portions 29a, 29b which engage with the hooks 61, 62, respectively. When the upper case 10 and the lower case 2 are screwed together, the hooks 61, 62 enter the recessed portions 29a, 29b to achieve a fitted state. Accordingly, even when the lower case 2 is subsequently detached, the separator 50 maintains the state of being held on the upper case 10 side.

Description

[Technical field]

[0001] The present invention relates to a battery pack and an electric device. [Background technology]

[0002] Cordless electric devices driven by a battery pack using secondary batteries such as lithium-ion batteries are widely used. For example, in a handheld power tool that drives a tool tip with a motor, a battery pack containing multiple secondary battery cells is used as a power source, and a load device such as a motor is driven by the electric energy stored in the battery pack. The battery pack is configured to be detachable from the main body of the electric device, and when the voltage drops due to discharge, the battery pack is removed from the main body of the electric device and charged using an external charger. As an example of such a battery pack, the technology of Patent Document 1 is known. In Patent Document 1, a battery cell and a separator that holds the battery cell are housed in a case, and a latch mechanism is provided for attaching and detaching the battery pack to and from the main body of the electric device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-46588 A Summary of the Invention [Problem to be solved by the invention]

[0004] The configuration of Patent Document 1 has a risk of causing the battery cell (terminal portion) to become misaligned if the lower case becomes displaced from the upper case for some reason (e.g., deterioration over time) while the battery pack is attached to the main body of the electrical device. In order to prevent the terminal portion from becoming misaligned from the upper case, it is possible to fix the terminal portion to the upper case, but there is a problem that the ease of assembly is deteriorated when the battery cell and separator are accommodated in the lower case and only the terminal portion is fixed to the upper case. In addition, it is possible to fix the battery cell (separator) and the terminal portion to the upper case, but depending on the fixing method, it is necessary to provide a through hole in the circuit board arranged above the separator, which may narrow the component arrangement area of ​​the circuit board or may require an increase in the board area.

[0005] The present invention has been made in view of the above background, and an object of the present invention is to provide a battery pack in which the terminals of the battery pack are prevented from shifting relative to the case that constitutes the rails, and an electrical device using the battery pack. Another object of the present invention is to provide a battery pack that can stably hold the case in which the rails of the battery pack are arranged and the assembly that fixes the terminals, without impeding the assemblability of the battery pack, or can prevent damage during disassembly or breakage, and an electrical device using the battery pack. Yet another object of the present invention is to provide a battery pack and an electrical device that do not increase the area of ​​the circuit board of the battery pack (narrow the component arrangement area). [Means for solving the problem]

[0006] Representative features of the invention disclosed in this application are as follows. According to one feature of the present invention, there is provided a battery pack having a first case having a slot portion for exposing a battery-side terminal portion and a guide portion for guiding attachment to an electrical device main body, a second case that is joined to the first case to define a space for accommodating a battery cell, a separator for holding the battery cell, a circuit board fixed to the separator on the side facing the first case, and a battery-side terminal portion fixed to a position corresponding to the slot portion of the circuit board and configured to be connectable to a main body-side terminal of the electrical device main body, wherein the separator has a connection portion that faces the first case and is provided around the circuit board when viewed from above, and the first case has a connected portion that is connected to the connection portion at a position corresponding to the connection portion. To Formed claws or one of the recesses and the connected part is the 1 case S The recess formed Or the other of the claws When the joined first and second cases are separated, the separator is held on the first case side by the latching state between the tabs and the recesses. When the first and second cases of the battery pack are joined, the latching state is maintained with the tabs and the recesses in a contacting or non-contacting state.

[0007] According to another feature of the present invention, a plurality of screw holes are provided on one side of the first case and the second case of the battery pack, a plurality of female screws corresponding to the screw holes are provided on the other side of the first case and the second case, and the first case and the second case are screwed together with the plurality of screws while the separator is housed in the first case and the second case. The longitudinal direction of the screws is oriented in the same direction as the joining direction, and the extension direction of the connection portion is formed in a direction perpendicular to the joining direction. The battery side terminal portion of the battery pack has a plurality of terminals arranged in parallel on the circuit board, and the connection portion has first connection portions respectively provided at positions located on both sides in the parallel direction of the plurality of terminals. Furthermore, the battery cell is cylindrical and supported by the separator so as to extend in the parallel direction of the plurality of terminals, and the connection portion has a second connection portion provided near the center of the parallel direction and at the end position of the separator in the front-rear direction. It is preferable that the second connection portions are provided on both sides of the separator in the front-rear direction.

[0008] According to yet another feature of the present invention, the first case of the battery pack has a protrusion that protrudes inward from an inner wall of the first case to restrict movement of the battery cells in space, and the connected part is provided on the protrusion. The battery pack also has a latch mechanism that is provided on the first case and performs attachment and detachment to the electrical device body, and the latch mechanism is located between the separator and the first case in a state in which the connecting part and the connected part are held. Furthermore, the connecting part of the battery pack has a hole part provided in the separator and a fastening member that is provided separately from the separator and passes through the hole part, and the connected part has a fastening hole into which the fastening member is inserted.

[0009] According to yet another feature of the present invention, there is provided a battery pack having a first case having a slot portion for exposing a battery-side terminal portion and a guide portion for guiding attachment to an electric device main body, a second case joining with the first case to define a space for accommodating a plurality of battery cells, a separator for holding the battery cells, a circuit board fixed to the separator on the side facing the first case, and a battery-side terminal portion fixed to a position corresponding to the slot portion of the circuit board and configured to be connectable to a main body-side terminal portion of the electric device main body, wherein the separator has a connecting portion extending around the circuit board when viewed from above, and the second case has a connected portion connected to the connecting portion. The connecting portion is a claw integrally formed with the separator, and the connected portion is a recessed portion formed in the second case. An electric device is constituted by the battery pack thus configured, and an electric device main body having a battery pack mounting portion to which the battery pack is mounted and a main body-side terminal portion provided in the battery pack mounting portion and connected to the battery-side terminal portion. Effect of the Invention

[0010] According to the present invention, it is possible to provide a battery pack in which the terminal of the battery pack is prevented from being displaced relative to the case side forming the rail portion, and an electric device using the battery pack. It is also possible to provide a battery pack in which the case in which the rail portion of the battery pack is arranged and the assembly for fixing the terminal portion can be stably held without impeding the assembling property of the battery pack, or in which damage during disassembly or damage can be prevented, and an electric device using the battery pack can be provided. It is also possible to provide a battery pack and an electric device that do not increase the area of ​​the circuit board of the battery pack (narrow the component arrangement area). Specifically, a connecting portion such as a claw portion is provided on the assembly (insulator) to which the battery side terminal portion is fixed, and when the assembly is housed in the first case and the second case, a connected portion such as a recess is formed on the first case side where the rail portion is formed, so that the connecting portion and the connected portion are in a connected state when the first case and the second case are joined, and therefore the first case and the assembly are held so as not to be separated. In this way, it is possible to make it difficult to separate the first case and the assembly while maintaining the assembling property of the battery pack. In particular, even if a strong impact is applied to the battery pack when the electrical device is dropped, etc., causing the first case and the second case to break and separate, there is a high probability that the connection between the first case and the assembly can be maintained, which significantly prevents the connection with the terminal part on the main body of the electrical device from becoming misaligned while it is attached. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a perspective view of an electric device body 201 and a battery pack 1 according to an embodiment of the present invention. [Diagram 2] 1A and 1B are external views of a battery pack 1 according to an embodiment of the present invention, where (A) is a top view and (B) is a side view. [Diagram 3] 2, and (B) is an enlarged view of part D in (A). [Figure 4] 2, and (B) is an enlarged view of part E in (A). [Diagram 5] FIG. 4 is a perspective view showing the appearance of a single separator 50 in FIG. [Figure 6]2 shows a state in which the upper case 10 of the battery pack 1 in FIG. 1 has been removed, with (A) being a perspective view and (B) being a right side view. [Figure 7] 2 is a top view of the battery pack 1 in FIG. 1 with the upper case 10 removed. [Figure 8] 1A shows a battery pack 1A according to a second embodiment of the present invention, in which (A) is a vertical cross-sectional view passing through the left-right center of the battery pack, and (B) is an enlarged view of part F in (A). [Figure 9] FIG. 2 is a perspective view of an upper case 10 alone of the battery packs 1 and 1A according to the first and second embodiments of the present invention, as viewed from below. [Figure 10] 10A is a vertical cross-sectional view (corresponding to the cross section of CC in FIG. 2) of a battery pack 1B according to a third embodiment of the present invention, and FIG. 10B is a top view of the battery pack 1B with an upper case 10B removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS EXAMPLES

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the same parts are given the same reference numerals, and repeated explanations will be omitted. In addition, in this specification, the front-rear, left-right, and top-bottom directions of the electrical device body and the battery pack will be described as being the directions shown in the drawings.

[0013] FIG. 1 is a perspective view of an electric device body 201 and a battery pack 1 according to an embodiment of the present invention. As the electric device body 201, an example of an impact tool with a rated voltage of 36V is shown. The electric device body 201 uses a removable battery pack 1 as a power source, and performs a tightening operation by driving a tip tool 209 using a rotational driving force of a motor (not shown). The electric device body 201 includes a housing 202 that is an outer frame forming an outer shape. The housing 202 is composed of a body part 202a that houses a motor and a power transmission mechanism (not shown), a handle part 202b that extends downward from the body part 202a, and a battery pack mounting part 202c formed on the lower side of the handle part 202b. A trigger-shaped operation switch 204 is provided in a part of the handle part 202b near where the index finger touches when the user holds it. A forward / reverse switching lever 205 for switching the rotation direction of the motor is provided above the operation switch 204. An anvil (not visible in the figure) serving as an output shaft is provided on the front side of the housing 202, and a tool holder 208 for mounting a tool tip 209 is provided at the tip of the anvil. In this example, a Phillips screwdriver bit is attached as the tool tip 209.

[0014] In the battery pack mounting section 202c, rail sections 211a and 211b including grooves and rails extending parallel to the front-rear direction are formed on the inner wall sections on both the left and right sides, and a terminal section (main body side terminal section) 215 is provided between them. The terminal section 215 is manufactured by integral molding of a non-conductive material such as synthetic resin, and multiple metal terminals, such as a positive input terminal 222, a negative input terminal 227, an LD terminal (abnormality signal terminal) 228, and serial connection terminals 229a and 229b, are cast into the terminal section 215. The terminal section 215 is manufactured by casting multiple metal terminals (terminals 222, 227, and 228 in this case) by molding synthetic resin, and has a vertical surface 215a that serves as an abutment surface in the mounting direction (front-rear direction) and a horizontal surface 215b. In addition, in FIG. 1, the illustration of other terminals (T terminal, V terminal, LS terminal) for signal transmission that are provided between or adjacent to the positive input terminal 222 and the negative input terminal 227 of the terminal unit 215 is omitted, but it is optional to add any of these terminals to the terminal unit 215.

[0015] The terminal portion 215 is fixed so as to be clamped in an opening portion (terminal holding portion: not visible in the figure) of the left-right split housing 202. The horizontal surface 215b of the terminal portion 215 is the surface that is adjacent to and faces the upper surface 13 of the battery pack 1 when the battery pack 1 is attached. A curved portion 212 that abuts against the raised portion 15 of the battery pack 1 is formed on the front side of the horizontal surface 215b, and a protrusion 214 is formed near the left-right center of the curved portion 212. The protrusion 214 also serves as a boss for screwing the housing of the electric device main body 201, which is formed in two parts in the left-right direction, and also serves as a stopper that limits the relative movement of the battery pack 1 in the attachment direction.

[0016] The battery pack 1 is detachable from the corresponding electric device body 201, and contains multiple battery cells in a synthetic resin case. On the upper part of the battery pack 1, there are provided rail grooves 18a (not visible in FIG. 1), 18b for mounting the battery pack on the electric device body 201, a slot portion 20 for achieving electrical connection with the electric device body 201, a group of connection terminals (described later in FIG. 6) arranged on the inner part of the slot portion 20, and a latch mechanism (latch portion) for maintaining or releasing the mounting state with the electric device body 201. The latch mechanism includes latch buttons 16a, 16b, and locking claws 17a (not visible in FIG. 1), 17b that move in conjunction with the latch buttons 16a, 16b.

[0017] The battery pack 1 is a so-called multi-volt compatible power source that can output either 18V or 36V. The battery pack 1 can be attached to either an electric device body (not shown) rated at 18V or an electric device body 201 rated at 36V. When attached to an electric device body rated at 18V, a direct current of rated 18V is output, and when attached to an electric device body 201 rated at 36V, a direct current of rated 36V is output. The output voltage of the battery pack 1 can be arbitrarily configured to be a low / high voltage switching type or a single voltage type, and the present invention can be applied to either type of battery pack. The rated voltage of the battery pack 1 is also arbitrary. After the battery pack 1 is removed from the electric device body 201, it can be charged using an external charger (not shown).

[0018] FIG. 2 shows a battery pack 1 according to an embodiment of the present invention, where (A) is a top view and (B) is a right side view. The battery pack 1 defines a space for accommodating a plurality of battery cells by a synthetic resin housing consisting of an upper case (first case) 10 and a lower case (second case) 2. It is important that both the upper case 10 and the lower case 2 are made of a non-conductive material, and in this example, they are manufactured by integral molding of polycarbonate. A flat lower surface 11 is formed on the front side of the upper case 10, and an upper surface 13 formed higher than the lower surface 11 is formed near the center. The lower surface 11 and the upper surface 13 are formed in a stepped shape, and the connecting portion between them is a step portion 12 that is a vertical surface. The portion forward of the step portion 12 to the upper surface 13 becomes a slot portion arrangement area (slot portion) 20. The slot arrangement region 20 has a top surface parallel to the mounting direction (front-rear direction) and a front surface (step portion 12) perpendicular to the mounting direction, on which multiple (eight in this example) notched slots 21-28 are formed. The slots 21-28 are cut out to have a predetermined length in the battery pack mounting direction (front-rear direction) and a predetermined width in a direction intersecting the battery pack mounting direction (left-right direction), and the front end portion located at the step portion 12 is cut out at a predetermined height in the up-down direction. The left-right width of the step portion 12 is formed slightly wider than the width near the rear end of the slots 21-28, and the left-right spacing narrows toward the rear near the step portion 12, making it easy to insert the terminals on the electrical device main body.

[0019] Two rail grooves 18a, 18b are formed on the side of the upper surface 13 of the upper case (first case) 10. The rail grooves 18a, 18b are formed such that the longitudinal direction is parallel to the mounting direction of the battery pack 1. The groove portions of the rail grooves 18a, 18b have an open end at the front side and a closed end at the rear side connected to the front wall surface of the raised portion 15. The slot portion 20 (slots 21 to 28) is disposed in the area sandwiched between the rail grooves 18a, 18b. The raised portion 15 is formed on the rear side of the upper surface 13 so as to be raised. The raised portion 15 has an outer shape that is raised above the upper surface 13, and a recessed stopper portion 15a is formed near the center of the raised portion. The stopper portion 15a serves as the abutting surface for the protrusion portion 214 (see FIG. 1) when the battery pack 1 is attached to the battery pack attachment portion 202c. When the protrusion portion 214 on the electrical device main body 201 is inserted until it abuts against the stopper portion 15a, multiple terminals (device side terminals) arranged on the electrical device main body 201 come into contact with multiple connection terminals (described later in FIG. 4) arranged on the battery pack 1, resulting in a conductive state.

[0020] Latch buttons 16a, 16b are provided on the left and right side surfaces of the rear portions of the rail grooves 18a, 18b. bare spring-loaded so as to be slidable in the left-right direction relative to the upper case 10 (the spring is not shown in the figure). The latch claws 17a, 17b (see FIG. 1) protrude in the left-right direction at the bottom of the rail grooves 18a, 18b (see FIG. 1) due to the action of the springs, and engage with recesses formed in the rail parts 211a, 211b of the electric device body 201 shown in FIG. 1, thereby preventing the battery pack 1 from falling off. When the latch buttons 16a, 16b are pressed inward while the battery pack 1 is attached to the electric device body 201, the latch claws 17a, 17b, which are fixed in conjunction with the latch buttons 16a, 16b, move inward, and the protruding state of the latch claws 17a, 17b from the rail grooves 18a, 18b is eliminated. When the protruding state is eliminated, the battery pack 1 can be removed from the body part of the electric device body 201 by sliding the battery pack 1 in the extending direction of the rail grooves 18a, 18b. The wall surfaces forming the rail grooves 18a, 18b are formed with through holes 19a, 19b (not visible in FIG. 2(B)) for allowing the engagement portions (latch claws) 17a, 17b (see FIG. 2) to protrude from the outer surface.

[0021] The lower case (second case) 2 is in the shape of a substantially rectangular parallelepiped with an open top and has a front side 3a, a rear side 3b, a right side 3c, a left side 3d, and a bottom 3e. The internal space of the lower case 2 has a volume sufficient to accommodate the separator 50.

[0022] A plurality of slits 13a serving as cooling air outlets are provided on the inner side of the stopper portion 15a. When the battery pack 1 is attached to the electrical device body 201, the slits 13a are covered and closed so as not to be visible from the outside. When the battery pack 1 is connected to a charging device (not shown) for charging, the slits 13a are used as vents for forcibly flowing cooling air into the battery pack 1. The cooling air taken into the battery pack 1 from a cooling air inlet (not shown) provided on the front wall of the lower case 2 of the battery pack 1 by the rotation of a fan provided on the charging device cools the battery cells and the like and is discharged to the outside from the slits 13a. The slits 13a may be configured as cooling air inlets so that the cooling air flows in the opposite direction.

[0023] A display unit 80 is provided on the rear inclined surface of the raised portion 15. The display unit 80 is provided with four display windows 81 to 84, and a push-button type switch button 85 is provided to the right of the display window 81. The switch button 85 is an operation unit operated by a user. Unillustrated LEDs (light emitting diodes) are arranged inside the display windows 81 to 84, and are lit from the inside of the display windows 81 to 84. The entire display unit 80 is covered with a laminate film, and the display windows 81 to 84 are configured such that a part of the printed laminate film is transparent or semi-transparent to allow light to pass through. The switch button 85 is a button operated by a user, and when the switch button 85 is pressed, the remaining battery level is displayed on the display windows 81 to 84 according to the remaining battery level of the battery pack 1.

[0024] Of the slots 21-28, the slot 21 on the side close to the rail groove 18a on the right side of the battery pack 1 is an insertion port for a positive electrode terminal for charging (C+ terminal), and the slot 22 is an insertion port for a positive electrode terminal for discharging (+ terminal). The slot 27 on the side close to the rail groove 18b on the left side of the battery pack 1 is an insertion port for a negative electrode terminal (- terminal). In the battery pack 1, the positive and negative sides of the power terminals for transmitting power are usually arranged so as to be sufficiently separated from each other. As viewed from the AA cross section (vertical plane) located in the center of the left and right, the positive terminals are provided in the slots 21 and 22 located sufficiently apart on the right side, and the negative terminal is provided in the slot 27 located sufficiently apart on the left side. Between the positive and negative terminals, a plurality of signal terminals for transmitting signals used to control the battery pack 1 and the electric device main body 201 or an external charging device (not shown) are arranged, and here, four slots 23-26 for signal terminals are provided between the power terminal groups. Slot 23 is a spare terminal insertion port, and in this embodiment, no terminal is provided. Slot 24 is an insertion port for a T terminal for outputting a signal serving as identification information for the battery pack 1 to the main body of the electrical device or a charging device. Slot 25 is an insertion port for a V terminal for inputting a control signal from an external charging device (not shown). Slot 26 is an insertion port for an LS terminal for outputting temperature information about the battery pack from a thermistor (temperature-sensing element) (not shown) provided in contact with the battery cell. To the left of slot 27, which serves as the insertion port for the negative terminal (- terminal), there is further provided a slot 28 for an LD terminal that outputs an abnormality stop signal from a battery protection circuit (described later) included in the battery pack 1.

[0025] Fig. 3(A) is a cross-sectional view taken along line AA in Fig. 2. Ten cylindrical battery cells 41a-41j are housed in the internal space formed by the upper case 10 and the lower case 2. The ten battery cells 41a-41j are stacked in two rows of five each, and secured in place by a separator 50 made of a non-conductor such as synthetic resin. The separator 50 is manufactured by integral molding of non-conductive synthetic resin, and is disposed so that the battery cells 41a-41j are penetrated in the left-right direction and both ends are exposed from the opening. By using the separator 50, the battery cells 41a-41j can be stably disposed in the internal space formed by the upper case 10 and the lower case 2 while being kept apart at a certain distance and not in contact with each other.

[0026] The battery cells 41a to 41j are so-called 18650 size lithium ion battery cells that can be charged and discharged multiple times, with a diameter of 18 mm and a length of 65 mm, and are arranged alternately so that the electrodes of adjacent battery cells face in the opposite directions. Adjacent battery cells are electrically and mechanically connected by a metal plate (not shown). The size and number of battery cells used in the battery pack according to the present invention are arbitrary, and the present invention can be widely applied to any battery pack in which a separator 50 is sandwiched between the battery pack housing sandwiched between the upper case 10 and the lower case 2. The shape of the battery cells fixed by the separator is not limited to a cylindrical shape, and may be a rectangular parallelepiped, a laminated shape, or other shapes.

[0027] Vertically adjacent battery cells 41a-41j are separated from each other by flat upper and lower partition walls 51e, and vertically adjacent battery cells 41a-41j are separated from each other by flat front and rear partition walls 53a-53d. The lower surface of the separator 50 is formed with a cylindrically curved bottom wall 51b that follows the contours of the battery cells 41a-41d.

[0028] A circuit board 70 is fixed to the upper side of the separator 50. The circuit board 70 is screwed to the separator 50 by two screws 79a, 79b. The circuit board 70 fixes (for example, solders) a plurality of connection terminals (described later in FIG. 6) and electrically connects these connection terminals to a circuit pattern (not shown). The circuit board 70 further mounts various electronic elements (not shown here) such as a battery protection IC, a microcomputer, a PTC thermistor, resistors, capacitors, fuses, and light-emitting diodes.

[0029] The upper case 10 and the lower case 2 can be separated in the vertical direction from the dividing surface, and when joined, they are fixed by a plurality of screws arranged in the vertical direction (the same direction as the joining direction). Here, two screw holes (not shown in the figure) are formed on each of the front side surface 3a and the rear side surface 3b of the lower case 2, and screw bosses 14a to 14d (see FIG. 9 for the symbols) with female threads are formed in the corresponding parts of the upper case 10, and the screws are screwed from bottom to top. In a conventional battery pack, an assembly of the separator 50 is prepared in a state in which the circuit board 70 is screwed and electrical wiring with the battery cells 41a to 41j is completed, and this assembly is sandwiched between the upper case 10 and the lower case 2, and the upper case 10 and the lower case 2 are screwed together in the sandwiched state. Specifically, the upper case 10 is covered with the assembly housed in the lower case 2, and the upper case 10 and the lower case 2 are screwed together. With this configuration, in the conventional separator, bottom wall 51b abuts against the bottom surface of lower case 2, and upwardly extending extension portions 57a-57g (see FIG. 5) formed around circuit board 70 abut against the inner wall surface of upper case 10, thereby holding circuit board 70 in place. Although not shown, a sponge-like cushioning material may be interposed between bottom wall 51b and the bottom surface of lower case 2.

[0030] In this embodiment, the connecting portion (claw portions 61, 62) for connecting to the upper case 10 by engagement or the like is further formed on the extending portion formed around the circuit board 70 and extending in the upward direction. That is, the connecting portion (claw portions 61, 62) is provided on the separator 50 so as to avoid penetrating the circuit board 70. This makes it possible to secure the area in which components of the circuit board 70 can be arranged. Meanwhile, the connecting portion (recesses 29a, 29b) corresponding to the claw portions 61, 62 is formed on the inside of the upper case 10. By forming the claw portions 61, 62 and the recesses 29a, 29b in this way, when assembling the upper case 10 and the lower case 2, the protruding portions of the claw portions 61, 62 in the front-rear direction are positioned within the internal space of the recesses 29a, 29b, and in this state, the upper case 10 and the lower case 2 are fixed by screws. With this configuration, when the upper case 10 and the lower case 2 are screwed together, the assembly (for example, composed of the circuit board 70, the battery cells 41a-41j, and the separator 50) and the upper case 10 are automatically fixed by the claws 61 and 62. In the configuration of this embodiment, the dividing surface between the upper case 10 and the lower case 2 is configured to have a horizontal opening, but the dividing surface may be inclined relative to the horizontal, may have a step, or may have a complex shape such as a curved surface. In other words, as long as the claws and the shaped parts corresponding to the claws prevent the separator 50 from being separated from the upper case 10, the claws and the corresponding shapes can be configured in any way.

[0031] 3B is an enlarged view of part D in FIG. 3A. The claw portion 61 is manufactured integrally with the separator 50, and extends upwardly of the positioning piece 54 of the separator 50 by a height h1 to form an extension portion, and further protrudes by a distance L1 in a direction perpendicular to the height direction (front side) of the positioning piece 54 of the separator 50 to form a connection portion. When the upper case (first case) 10 and the lower case (second case) 2 are joined, the separator 50 is provided with the claw portion 61 to be connected to the first case 10, and a connected portion (recess 29a) is formed at a portion corresponding to the claw portion 61 of the upper case 10, and when the upper case 10 and the lower case 2 are joined, the claw portion 61 is elastically deformed and fits into the recess of the recess 29a, so that the claw portion 61 and the recess 29a are connected (hooked). The claw portion 61 and the recess 29a are maintained in a contact state or a non-contact state. The shape of the claw portion 61 is arbitrary, but the portion protruding forward has a length L1, and the upper surface of the protruding portion of the claw portion 61 of L1 is formed with an inclined surface 61a that becomes lower from the rear side to the front side, in other words, the position decreases toward the outside of the separator 50. By forming the inclined surface 61a on the claw portion 61 in this manner, when the upper case 10 and the separator 50 are connected, the inclined surface 61a slides against the inner wall surface of the upper case 10, so that the claw portion 61 elastically deforms inward (toward the side away from the opposing wall surface of the upper case 10), and when the separator 50 is normally assembled until the hooking portion of the claw portion 61 (the portion of length L1, which is the range from the inclined surface 61a to the lower surface 61b when viewed in the vertical direction) comes to a position facing the recess 29a, the claw portion 61 returns from the elastically deformed state to its original state, so that the hooking portion of the claw (the portion of length L1) is located within the recess 29a, and the hooking state shown in FIG. 3(B) is achieved. The lower surface 61b of the claw portion 61 is a horizontal surface, and the lower surface of the recess 29a is also a horizontal surface, so that by joining or adjoining these, even when the upper case 10 and the lower case 2 are disassembled, the separator 50 maintains a state of being connected (hooked) to the upper case 10 by the action of the claw portion 61. As described above, the shape of the claw portion 61 has been explained with reference to FIG. 3(B), but a claw portion 62 is also formed on the rear positioning piece 55 side of the separator 50, and the portion of the upper case 10 facing the claw portion 62 has Recess The relationship between the claw portion 62 and the recessed portion 29b is similar to the relationship between the claw portion 61 and the recessed portion 29a.

[0032] Fig. 4(A) is a cross-sectional view taken along line BB in Fig. 2. Eight slots 21-28 (see Fig. 2 for reference symbols) are formed in the upper case 10, and battery side terminals, i.e., power terminals 31, 32, 37 and signal terminals 34-36, 38 are provided inside the slots. Since the battery pack 1 of this embodiment is compatible with so-called multi-volts, lower terminals 39a, 39b connected to series connection terminals 229a, 229b are also provided. The positive terminal 32 and the lower terminal 39a are the positive terminals of the upper cell unit consisting of battery cells 41a-41e arranged on the upper side, and the positive terminals of the battery cells 41f-41e arranged on the lower side. j The negative terminal 37 and the lower terminal 39b are connected to either the negative terminal of the upper cell unit or the negative terminal of the lower cell unit. The underside of the circuit board 70 is supported by ribs 58a-58g extending upward from the upper wall 51a of the separator 50. The vicinity of the legs of the battery side terminal is covered by a board cover 78 made of synthetic resin.

[0033] Claws 63 and 64 are formed on both the left and right sides of the upper surface of the separator 50, outside the circuit board 70. Recesses 29c and 29d are provided on the inner wall surface of the upper case 10 facing the claws 63 and 64. That is, the separator 50 is provided with a connecting portion (claws 63 and 64) for connecting to the upper case (first case) 10, and a connected portion (recesses 29c and 29d) is formed at a portion of the upper case 10 corresponding to the claws 63 and 64, and when the upper case 10 and the lower case 2 are joined, the claws 63 and 64 and the recesses 29c and 29d are in a connected state (or hooked state). The shape of the claw 63 is the same as the claws 61 and 62, and has a length L2 of a portion protruding in the lateral direction. The upper surface of the protruding portion of the claw 62 with the length L2 is formed with an inclined surface 63a that descends from the inside to the outside. By forming inclined surface 63a on claw portion 63 in this manner, when upper case 10 and lower case 2 are joined, inclined surface 63a slides against the inner wall surface of upper case 10, causing claw portion 63 to elastically deform inward (away from the opposing wall surface of upper case 10). When separator 50 is assembled normally until the hook portion of claw portion 63 (the portion with length L2, which is the range from inclined surface 63a to lower surface 63b when viewed in the vertical direction) comes to a position facing recess 29c, claw portion 63 returns to its original state (returns to its original elastic deformation), and the hook portion (the portion with length L2) is positioned within recess 29c, as shown in Figure 4(B).

[0034] Since the lower surface 63b of the claw portion 63 is a horizontal surface and the lower side surface of the recessed portion 29c is also a horizontal surface, the separator 50 maintains a state of being connected to the upper case 10 by joining or adjoining these even when the upper case 10 and the lower case 2 are disassembled. The shape of the claw portion 63 has been described above with reference to FIG. 4(B), but the claw portion 64 and the recessed portion 29d are similarly formed on the left side of the separator 50. The claw portions 61 to 64 and the recessed portions 29a to 29d may be connected in a strong fitted state in which the lower surface 63b of the claw portion 63 is in close contact with the recessed portion 29c, but the claw portions 61 to 64 and the recessed portions 29a to 29d may also be connected in a loose engagement state in which they are loosely in contact with each other or spaced apart by a small distance. Since the separator 50 itself is held by the upper case 10 and the lower case 2, unless an incident occurs in which the upper case 10 and the lower case 2 become separated (for example, due to loosening of the screws, damage to the screws, damage to the lower case 2, etc.), the fixation by the claws 61-64 and the recesses 29a-29d is not important.

[0035] Figure 5 shows the 3 5 is a perspective view showing the appearance of the separator 50 alone. FIG. 5 shows the state before the battery cells 41a-41j are attached. The separator 50 is a battery holding member for holding a plurality of battery cells 41a-41j (see FIG. 3) arranged in two upper and lower stages and five front and rear rows, with only the left and right ends of the battery cells being open. When assembling, the battery cells 41a-41j are inserted into the cylindrical space of the separator 50, and the terminals exposed on the left and right sides of the separator are connected to each other by a connection plate (not shown). The connection plate (not shown) is electrically connected to the circuit board 70 by a lead wire or a metal plate (not shown). The separator 50 is manufactured by molding a non-conductive material that does not conduct electricity, such as a synthetic resin. Synthetic resin has a characteristic of being more elastic than metal and therefore has excellent vibration absorption properties.

[0036] The upper wall 51a of the separator 50 is configured to include an arcuate surface that fits along the outer edge of the cylindrical battery cells (not shown). The circuit board 70 is fixed to the upper side of the upper wall 51a with two screws 79a, 79b (see FIG. 3), not shown, so the upper wall 51a is formed to cover the entire cylindrical surfaces of the battery cells 41a-41e. Screw bosses 56a, 56b are formed in two places, near the rear end and the front end of the upper wall 51a. The upper wall 51a of the separator 50 is formed with a plurality of ribs 54a, 57a-57g that extend upward and abut against the upper case 10. In addition, a plurality of ribs 58a-58g are formed to abut against the bottom surface of the circuit board 70. In addition, tab fixing portions 59a-59d that hold metal tabs that solder the electrodes of the battery cells to the circuit board 70 are formed on the upper side of the circuit board 70.

[0037] A positioning piece 54 for connecting with the inner wall surface of the lower case 2 is formed on the upper part of the front wall surface 51c of the separator 50, and a claw portion 61 and a rib 54a are formed on the upper part of the positioning piece 54. A positioning piece 55 is formed on the upper part of the rear wall surface 51d of the separator 50, and a claw portion 62 is formed on the upper part of the positioning piece 55. Claw portions 63 and 64 are formed on the upper right and left upper parts of the separator 50. As shown in Figs. 3 and 4, the claw portions 61 to 64 engage with the upper case 10. The manufacturing and assembling method of the battery pack 1 of this embodiment is the same as that of a conventional battery pack, and an assembly of the separator 50 with the battery cells 41a to 41j and the circuit board 70 installed and wired is placed inside the lower case 2, and the upper case 10 is aligned with the upper side of the separator 50, and then the upper case 10 and the lower case 2 are joined by four screws (not shown). Through these assembly steps, the claws 61-64 engage with the recesses 29a-29d of the upper case 10. Note that the lower case 2 may be joined (screw-fixed) after the assembly of the upper case 10 and the separator 50 is connected.

[0038] When disassembling the battery pack 1, the separator 50 and the lower case 2 can be easily separated by removing four screws (not shown) that fasten the upper case 10 and the lower case 2. However, since the claws 61-64 are engaged with the upper case 10, the separator 50 maintains a state of being connected to the upper case 10. Therefore, there is no change in the positional relationship between the slots 21-28 of the upper case 10 and the terminal group (31, 32, 34-38, 39a, 39b). Since the positional relationship between the upper case 10 and the main body side terminal group fixed to the circuit board 70 does not shift in this way, even if the electric device main body 201 is dropped from a high position and the case of the battery pack 1 is destroyed, the relative positional relationship between the main body side terminals on the electric device main body 201 side and the terminal group on the battery pack 1 side is unlikely to shift, so that the risk of electrical contact failure between the terminals due to deformation of the terminals or the like can be significantly reduced.

[0039] The bottom wall 51b of separator 50 has an arc-shaped outer surface only near the left and right ends of cylindrical battery cells 41a-41j (not shown), but no wall surface is formed near the left and right center. This is for reasons of weight reduction and molding of separator 50.

[0040] 6 is a diagram of the battery pack 1 in FIG. 1 with the upper case 10 removed, (A) being a perspective view, and (B) being a right side view. The material of the circuit board 70 is a printed circuit board in which a pattern wiring is printed with a conductor such as copper foil on a substrate impregnated with a resin that is insulating against the material, and a single-layer board, a double-sided board, or a multilayer board can be used. In this embodiment, a multilayer board is used to form wiring patterns on the upper surface (the surface that is the upper surface as seen from FIG. 4) and the lower surface of the circuit board 70. Illustrations of LSIs, ICs, other electronic elements mounted on the circuit board 70, and circuit patterns are omitted.

[0041] A plurality of connection terminals (31, 32, 34-38) are fixed in a horizontal line in a portion slightly forward of the center in the front-rear direction of the circuit board 70. Each of the connection terminals is made of metal, and has two sets of arms extending horizontally by pressing, one set on the upper left and right sides and one set on the lower left and right sides. Each of the connection terminals is connected from the upper surface (front surface) to the back surface (bottom surface) of the circuit board 70. penetration The connecting terminals (31, 32, 34-38) have legs that penetrate through a plurality of mounting holes formed in the circuit board 70 from the front surface to the back surface, and the legs are soldered to the back surface (lower surface) of the circuit board 70. This soldering is performed to the conductive wiring pattern provided on the back surface of the circuit board 70, so that the connecting terminals (31, 32, 34-38) are fixed to the circuit board 70 and electrically connected to the wiring pattern by soldering. In the present invention, the connecting terminals (31, 32, 34-38) are fixed by the circuit board 70, and when the upper case 10 is removed as shown in FIG. 6(A), the connecting terminals (31, 32, 34-38) are positioned on the circuit board 70 side, so that any method of connecting the connecting terminals (31, 32, 34-38) to the circuit board 70 can be used, and any other known shape of the connecting terminals or a method of fixing to the circuit board 70 may be selected.

[0042] Three signal terminals (T terminal 34, V terminal 35, LS terminal 36) are provided between the positive terminal 32 and the negative terminal 37. An LD terminal 38 is provided to the left of the negative terminal 37, and a positive terminal 31 for charging is provided to the right of the positive terminal 32. As described above, electronic elements (not shown) are mounted on the circuit board 70, and after a plurality of connection terminals are fixed by soldering, a board cover 78 is provided around the connection terminals (31, 32, 34 to 38), and the surface of the circuit board 70 is hardened with resin (not shown) to perform a dustproofing and waterproofing treatment, and then the circuit board 70 is fixed to the separator 50 by two screws 79a and 79b.

[0043] The separator 50 has four claws 61-64 (64 is not visible in the figure) formed near the upper outer periphery. As can be seen from the right side view of FIG. 6(B), the upper ends of the claws 61-64 are formed to be located above the opening position (partition surface) of the lower case 2 and below the circuit board 70. The claw 62 is disposed between the two screw holes 4c and 4d. Therefore, even if the connection state between the rear part of the upper case 10 and the lower case 2 by the screw holes 4c and 4d is broken for some reason, the claw 62 maintains the connection state between the rear wall surface 51d of the separator 50 and the upper case 10. Similarly, the claw 61 is disposed between the two screw holes 4a and 4b (see FIG. 7 for 4b), so that the claw 61 maintains the connection state between the front wall surface 51c of the separator 50 and the upper case 10 even if the connection state between the front part of the upper case 10 and the lower case 2 by the screw holes 4a and 4b is broken. As shown in FIG. 6B, the battery cells 41a to 41j and the circuit board 70 are connected to each other through connection parts 75b and 75c using lead wires and metal plates. 6th grade are electrically connected by soldering.

[0044] 7 is a top view of the battery pack 1 with the upper case 10 removed. The claws 63, 64 provided on the left and right sides of the separator 50 are provided at positions located on both sides in the parallel direction of the multiple battery side terminals (31, 32, 34 to 38), and their length in the front-rear direction is L. f This length L f The position occupied by the connecting terminals (31, 32, 34 to 38) is the length L t In other words, by arranging the claws 63, 64 near the connection terminals 31, 38, even if for some reason the side portions of the upper case 10 and the lower case 2 are separated from each other due to the screw holes 4a-4d, the connection between the separator 50 and the upper case 10 can be maintained near the connection terminals (31, 32, 34-38). t It is not essential in the present invention that the length L t Range and length L fFurthermore, the separator 50 may have a plurality of claws 63, 64 on the right and left side surfaces thereof, or may have a claw that is sufficiently long in the front-rear direction (for example, the length L t The claws 63 and 64 may be of any shape, provided that they are capable of latching the separator 50 and the upper case 10 when the upper case 10 and the lower case 2 are screwed together. Furthermore, the claws 63 and 64 may be formed on the inside of the upper case 10 and the recesses 29a to 29d, so that the positional relationship between the claws 61 to 64 and the recesses 29a to 29d is reversed. Ribs 5a to 5e (5b not shown) and 6a to 6e (6b not shown) for holding the battery cells 41a to 41e from rattling in the left-right direction are formed on both the left and right sides of the inner wall surface of the lower case 2 at positions facing the left and right sides (see FIG. 3). Each rib is a plurality of plate-like pieces extending vertically (up and down) and is molded integrally with the lower case 2. EXAMPLES

[0045] 8 is a cross-sectional view showing a battery pack 1A according to a second embodiment of the present invention, and (A) is a vertical cross-sectional view passing through the left-right center of the battery pack. The difference from the battery pack 1 of the first embodiment is that the separator 50A is provided with claws (first connection parts) 161, 162 that engage with the upper case 10 and claws (second connection parts) 165, 166 that engage with the lower case 2A. The upper case 10 is the same part as that of the first embodiment shown in FIG. 3, including the provision of the recesses 29a, 29b. Meanwhile, the lower case 2A is newly formed with recesses 7a, 7b that engage with the claws 165, 166.

[0046] Fig. 8(B) is an enlarged view of part F in (A). As can be seen by comparing Fig. 8(B) with Fig. 3(B), the claws 165, 166 newly added to the separator 50A are convex parts extending forward or backward from parts of the positioning pieces 54, 55, and only the convex parts (claws 165, 166) are added while maintaining the basic shape of the separator 50 shown in Fig. 3. An inclined surface 166a is formed on the lower side of the claw 166, and a horizontal upper surface 166b is formed on the upper side. Similarly, an inclined surface 165a is formed on the lower side of the front claw 165, and a horizontal upper surface 165b is formed on the upper side. In this way, the inclination directions of inclined surfaces 161a, 162a of claws 161, 162 that engage with upper case 10 and inclined surfaces 165a, 166a of claws 165, 166 that engage with lower case 2A are opposite to each other, in other words, are symmetrical with respect to the dividing plane, so that separator 50A is connected (latched) to upper case 10 and lower case 2A by simply sandwiching separator 50A between upper case 10 and lower case 2A using the same assembly method as in the past, due to the action of the inclined surfaces of claws 161, 162, 165, 166. In this state, upper case 10 and lower case 2A are fixed with four screws (not shown), which makes the battery pack more resistant to vibration and dropping than conventional battery packs. Although not visible in Fig. 8, claws 63, 64 (see Fig. 5) formed on the upper right and upper left side surfaces of separator 50A also have claws that engage with upper case 10, and claws that engage with lower case 2A toward lower case 2A. Note that the left and right side surfaces may only have claws 63, 64 that hook onto upper case 10. Also, in the embodiment of Fig. 8, claws (161-164) that engage with upper case 10 and claws (165, 166, etc.) that engage with lower case 2A are formed at the same horizontal position, but they do not have to be at the same position, and the claws may be positioned offset from each other in the horizontal direction.

[0047] In the battery packs 1, 1A of the first and second embodiments, since the rail mechanism (guide portion) that guides attachment to the electrical device body 201 and the slot portion 20 are present on the upper case 10 side, it is considered important to fix the upper case 10 and the separator 50, 50A with the claw portions and recesses. However, in the case of a battery pack in which engagement between the separator 50A and the lower case 2A alone is sufficient for some reason, the claw portions 161, 162 that engage with the upper case side may be omitted, and only the claw portions 165-168 that engage with the lower case side may be formed.

[0048] Here, the upper case (first case) 10 will be described with reference to Fig. 9. Fig. 9 is a perspective view of the upper case 10 alone of the battery packs 1 and 1A according to the first and second embodiments of the present invention, as viewed from below. And rear side The wall surface has four screw bosses 14a to 14b for screwing to the lower case 2 (or 2A). d The screw bosses 14a to 14 d A female screw (not shown in the figure) is formed on the inside of each of the upper case 10B. On both left and right side portions (the left side portion is not shown in the figure) of the inner wall surface of the upper case 10, a plurality of ribs (protrusions) 30a-30e are formed protruding inward from the inner wall of the upper case 10 in order to restrict the movement of the upper battery cells 41a-41e (see FIG. 3) within the space defined by the upper case 10 and the lower case 2. The ribs 30a, 30b, and 30e are a plurality of plate-like pieces extending vertically and left-right, and three pieces are formed here. The ribs 30c and 30d are each a single plate-like piece. The ribs 30a-30e are molded integrally with the upper case 10B. These ribs 30a-30e are provided so as to be continuous in the up-down direction with the ribs 5a-5e and 6a-6e shown in FIG. 7, respectively.

[0049] The upper parts of the three plate-like pieces of rib 30b have notches recessed to the right from the left-right center line. The outline of this notch becomes recess 29c described in Figure 4. Although not visible in Figure 9, a similar recess 29d is also formed in the left-hand inner wall surface of upper case 10. In this way, by simply changing a portion of the shape of the existing part (rib 30b), it is possible to form the connected portion (recesses 29c, 29d) on the upper case 10 side while maintaining the existing function (preventing rattling of the battery cell).

[0050] A latch mechanism is provided in the upper case 10. The latch mechanism is composed of latch buttons 16a, 16b, engaging portions (latch claws) 17a, 17b formed integrally with the latch buttons 16a, 16b, a spring means (not shown in the figure) that biases the latch buttons 16a, 16b outward from the left-right center, and a latch plate 91 for holding the latch buttons 16a, 16b and the spring in the upper case 10B. The upper sliding surfaces of the latch buttons 16a, 16b are held by ribs (not shown in the figure) formed on the inner wall of the upper case 10B, and the lower sliding surfaces thereof are held by ribs (not shown in the figure) formed on the upper surface of the latch plate 91. The latch plate 91 is fixed to the upper case 10 by screws 92. The latch plate 91 on the latch button 16b side is also fixed to the upper case 10 by screws 92. EXAMPLES

[0051] Next, a third embodiment of the present invention will be described with reference to FIG. 10. In the third embodiment, a latch plate 91 forming a lower sliding surface as shown in FIG. 9 is integrally formed with a separator 50B, and this configuration eliminates the need for the latch plate 91 and the screws 92 for fixing the latch plate 91 to the upper case 10, thereby reducing assembly costs. The separator 50B has claws 61-64, which engage with recesses 29a, 29b (see FIG. 3) and recesses 29c, 29d (see FIG. 4) formed in the upper case 10B. Therefore, if the separator 50B can be made to function as the latch plate 91, the installation of the latch plate 91 can be omitted, and furthermore, the operation of fastening the latch plate 91 with the screws 92 during assembly can also be omitted. By using a separator 50B according to the third embodiment (described later in FIG. 10) and connecting (hooking) the separator 50B to the upper case 10B, the latch mechanism is held between the upper case 10B and the separator 50B, and the latch plate 91 and the screws 92 can be omitted.

[0052] 10(A) is a vertical cross-sectional view of a battery pack 1B according to the third embodiment (corresponding to a cross-section of part CC in FIG. 2), and (B) is a top view of the battery pack 1B with the upper case 10B removed. The separator 50B according to the third embodiment differs from the separator 50 of the first embodiment shown in FIG. 5 in that latch holding portions 155, 156 are formed below the latch buttons 16a (not visible in the figure) and 16b. The latch holding portions 155, 156 are rectangular parallelepipeds, and their upper surfaces become the lower sliding surfaces of the latch buttons 16a, 16b. By adding the function of the latch plate 91 shown in FIG. 9 to the separator 50 in this way, the number of steps in the manufacturing process can be reduced. In order to provide the latch holding portions 155 and 156, as shown in FIG. 10(B), a part of the circuit board 70A is cut into a rectangular shape to provide cutout portions 71a and 71b, and the latch holding portions 155 and 156 are configured to extend upward from the cutout portions 71a and 71b. On the other hand, even if the latch holding portions 155 and 156 are provided, the claw portions 61 to 64 can be configured in the same manner as in the first embodiment. In the battery pack of the third embodiment, the upper case 10B is connected to the lower case 2 after the assembly of the separator 50 is connected to the upper case 10B to hook (fit) the claw portions 61 to 64 and the recesses 29a to 29d (see FIG. 3 and FIG. 4).

[0053] Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-mentioned embodiments, and various modifications are possible within the scope of the present invention. For example, in the first and second embodiments, the separator 50 is configured to be held to the upper case 10 using the claws 61-64, 161-166 formed on the separator 50, but the same effect as the present invention can be obtained by forming a plurality of fastening holes (connecting portions) in the separator 50, forming screw bosses (connected portions) corresponding to the upper case 10 into which screws are inserted, and then connecting the upper case 10 and the lower case 2 using a plurality of screws as fastening members that penetrate the fastening holes. In this case, the screws may be fastened so as to penetrate the circuit board 70, but if the screws are fastened so as to avoid the circuit board 70, the component arrangement area of ​​the circuit board 70 can be secured. [Explanation of symbols]

[0054] 1,1A,1B...Battery pack, 2,2A...Lower case, 3a...Front side, 3b...Rear side, 3c...Right side, 3d...Left side, 3e...Bottom, 4a~4d...Screw holes, 5a~5 e ...Rib, 6a~6 e ...rib, 7a, 7b...recess, 10, 10B...upper case, 11...lower surface, 12...step, 13...upper surface, 13a...slit, 14a to 14d...screw boss, 15...raised portion, 15a...stopper portion 、1 6a, 16b... latch button, 17a, 17b... locking claw, 18a, 18b... rail groove, 19a, 19b... through hole, 20... slot arrangement area, 21 to 28... slot, 29a to 29d... recess, 30a to 30e... rib, 31... positive electrode terminal for charging, 32... positive electrode terminal, 34... T terminal, 35... V terminal, 36... LS terminal, 37... negative electrode terminal, 38... LD terminal, 39a, 39b... lower terminal, 41a to 41j... battery cell 、5 0, 50A, 50B...separator, 51a...upper wall, 51b...bottom wall 、 51c: front wall, 51d: rear wall, 51e: upper and lower partition wall 、 53a to 53d: front and rear partition walls, 54, 55: positioning pieces, 54a: rib 、 56a, 56b...screw boss, 57a~57g...extension part 、 58a~58g...Rib, 59a~59d...Tab fixing part, 61~64...Claw part 、 61a, 63a...Slope surface, 61b, 63b...Bottom surface 、 70, 70A...circuit board, 71a, 71b...notch portion 、 75b,76 a… Connection portion, 78... board cover, 79a, 79b... screws, 80... display portion, 81-84... display windows 、 85…switch button, 91…latch plate, 92…screw 、 155, 156... latch holding portion, 161 to 164... (upper) claw portion 、 161a, 162a...(claw portion) inclined surface, 165-168...(lower side) claw portion 、 165a, 166a...(claw portion) inclined surface, 165b, 166b...(claw portion) upper surface 、201: Electric device body, 202: Housing, 202a: Body part 、 202b: handle portion; 202c: battery pack mounting portion 、 204...operation switch (trigger switch), 205...forward / reverse switching lever 、 208... Tip tool holding part, 209... Tip tool 、 211a, 211b... rail portion, 212... curved portion, 214... protrusion portion 、 215... terminal portion (terminal portion on the main body side), 215a... vertical surface 、 215b... horizontal surface, 222... positive input terminal, 227... negative input terminal 、 228...LD terminal, 229a, 229b...serial connection terminals

Claims

1. a first case having a slot portion for exposing the battery side terminal portion and a guide portion for guiding the battery to be attached to the main body of the electrical device; a second case joined to the first case to define a space for accommodating a battery cell; A separator that holds the battery cell; a circuit board fixed to a side of the separator facing the first case; the battery-side terminal portion is fixed to a position of the circuit board corresponding to the slot portion and is configured to be connectable to a main body-side terminal of the electrical device main body, the separator has a connection portion that faces the first case and is provided around the circuit board when viewed from above, The battery pack according to claim 1, wherein the first case has a connected portion at a position corresponding to the connecting portion, the connected portion being connected to the connecting portion.

2. 2. The battery pack according to claim 1, the connecting portion is one of a tab portion and a recess portion formed on the separator, the connected portion is the other of the recess or the claw portion formed in the first case, a first case and a second case which are joined together, the first case and the second case being separated from each other by the engagement between the claw portion and the recess portion, the separator being held on the first case side.

3. 3. The battery pack according to claim 2, a first case and a second case, the first case and the second case being joined together, the tabs and the recesses being maintained in a contacting or non-contacting state;

4. The battery pack according to any one of claims 1 to 3, a plurality of screw holes are provided on one side of the first case and the second case; a plurality of female screws corresponding to the screw holes are provided on the other side of the first case and the second case; the first case and the second case are fastened to each other by a plurality of screws in a state in which the separator is housed in the first case and the second case, The longitudinal direction of the screw is oriented in the same direction as the direction of the joint; The battery pack according to claim 1, wherein the connecting portion extends in a direction perpendicular to the joining direction.

5. The battery pack according to any one of claims 1 to 4, the battery-side terminal portion has a plurality of terminals arranged in parallel on the circuit board, The battery pack according to claim 1, wherein the connection portion includes first connection portions provided at locations located on both sides of the parallel direction of the plurality of terminals.

6. 6. The battery pack according to claim 5, The battery cell has a cylindrical shape and is supported by the separator so as to extend in a parallel direction of the plurality of terminals, the connecting portion includes a second connecting portion provided near the center in the parallel direction and at an end position in the front-rear direction of the separator.

7. 7. The battery pack according to claim 6, The battery pack according to claim 1, wherein the second connection portion is provided on both sides of the separator in the front-rear direction.

8. The battery pack according to any one of claims 1 to 7, the first case has a protrusion that protrudes inward from an inner wall of the first case to restrict movement of the battery cell in the space; The battery pack according to claim 1, wherein the connected portion is provided on the protruding portion.

9. 9. The battery pack according to claim 1, a latch mechanism provided in the first case for attaching to and detaching from the electrical device body, the latch mechanism is positioned between the separator and the first case in a state in which the connecting portion and the connected portion are held together.

10. 9. The battery pack according to claim 1, the connection portion includes a hole portion provided in the separator, and a fastening member provided separately from the separator and passing through the hole portion, The battery pack according to claim 1, wherein the connected portion has a fastening hole into which the fastening member is inserted.

11. a first case having a slot portion for exposing the battery side terminal portion and a guide portion for guiding the battery to be attached to the main body of the electrical device; a second case joined to the first case to define a space for accommodating a plurality of battery cells; A separator that holds the battery cell; a circuit board fixed to a side of the separator facing the first case; the battery-side terminal portion is fixed to a position of the circuit board corresponding to the slot portion, and is configured to be connectable to a main body-side terminal portion of an electric device main body, the separator has a connection portion that extends around the circuit board when viewed from above and that elastically deforms; The second case has a connected portion that is connected to the connecting portion.

12. 12. The battery pack according to claim 11, the connecting portion is a claw integrally provided on the separator, The battery pack according to claim 1, wherein the connected portion is a recess provided in the second case.

13. A battery pack according to any one of claims 1 to 12; an electrical device main body having a battery pack mounting portion to which the battery pack is mounted and a main body side terminal portion provided on the battery pack mounting portion and connected to the battery side terminal portion; An electrical device comprising:

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